Current multi-byte related codes have a bug with SQL_ASCII

support. Included patches will solve it and should be applied to
both trees.  Also, it fix the problem with \c command of psql when
switching different encoding databases.

Regression tests passed.
--
Tatsuo Ishii
t-ishii@sra.co.jp

src/backend/utils/mb/conv.c

@@ -2,7 +2,7 @@
  * conversion between client encoding and server internal encoding
  * (currently mule internal code (mic) is used)
  * Tatsuo Ishii
- * $Id: conv.c,v 1.3 1998/09/01 04:33:21 momjian Exp $
+ * $Id: conv.c,v 1.4 1998/12/14 04:59:58 momjian Exp $
  */
 #include <stdio.h>
 #include <string.h>
@@ -487,7 +487,7 @@ mic2ascii(unsigned char *mic, unsigned char *p, int len)
 {
 	int			c1;
 
-	while (len > 0 && (c1 = *mic))
+	while (len-- > 0 && (c1 = *mic))
 	{
 		if (c1 > 0x7f)
 			printBogusChar(&mic, &p);
@@ -495,6 +495,7 @@ mic2ascii(unsigned char *mic, unsigned char *p, int len)
 		{						/* should be ASCII */
 			*p++ = c1;
 		}
+		mic++;
 	}
 	*p = '\0';
 }

src/bin/psql/psql.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/bin/psql/Attic/psql.c,v 1.164 1998/11/17 14:26:31 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/bin/psql/Attic/psql.c,v 1.165 1998/12/14 04:59:58 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -84,6 +84,11 @@ char	   *__progname = "psql";
 
 #endif
 
+#ifdef MULTIBYTE
+/* flag to indicate if PGCLIENTENCODING has been set by a user */
+static	int	   has_client_encoding;
+#endif
+
 /* This prompt string is assumed to have at least 3 characters by code in MainLoop().
  * A character two characters from the end is replaced each time by a mode character.
  */
@@ -1485,6 +1490,18 @@ do_connect(const char *new_dbname,
 		/* FIXME: if changing user, ought to prompt for a new password? */
 		pwparam = PQpass(olddb);
 
+#ifdef MULTIBYTE
+		/* PGCLIENTENCODING may be set by the previous connection.
+		   if a user does not explicitly set PGCLIENTENCODING,
+		   we should discard PGCLIENTENCODING so that
+		   libpq could get the backend encoding as the default
+		   PGCLIENTENCODING value. -- 1998/12/12 Tatsuo Ishii */
+		   
+		if (!has_client_encoding) {
+			unsetenv("PGCLIENTENCODING");
+		}
+#endif
+
 		pset->db = PQsetdbLogin(PQhost(olddb), PQport(olddb),
 								NULL, NULL, dbparam, userparam, pwparam);
 
@@ -2754,6 +2771,10 @@ main(int argc, char **argv)
 	settings.getPassword = 0;
 #endif
 
+#ifdef MUTIBYTE
+	has_client_encoding = getenv("PGCLIENTENCODING");
+#endif
+
 	while ((c = getopt(argc, argv, "Aa:c:d:ef:F:lh:Hnso:p:qStT:ux")) != EOF)
 	{
 		switch (c)